Safety attachment for elevators



H. STEINBACK.

SAFETY ATTACHMENT FOR ELEVATORS.

APPLICATION FILED FEB-M1919.

Patented Mal". 2, 1920;

- 3mm Jiartman ,S'tez'n bac/T UNITED STATES PATENT OFFICE.

HARTMAN STEINBACK, OF DETROIT, MICHIGAN.

SAFETY ATTACHMENT FOR ELEVATORS.

Application filed February 1, 1919.

To all whom it may concern..-

Beit known that I, HARTMAN STEINBACK, a citizen of the United States of America, residing at Detroit, in the county of Mayne and State of Michigan, have invented certain new and useful Improvements in Safety Attachments for Elevators, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to safety attachments for elevators of that type in which the opening of the door or gate will automatically lock the control to hold the car stationary. It is the object of the invention to provide an eflectual lock without'injury to the cable or other control mechanism, and to this end the invention comprises the construction as hereinafter set forth.

In the drawings:

Figure l is a horizontal section through an elevator shaft provided with my improved safety device;

Fig. 2 is an enlarged View of a portion of Fig. 1;

Fig. 3 is a side elevation thereof.

A is the elevator shaft, which at the va rious landings is provided with doors Band C. As shown, the door B is hinged to swing, while the door 0 slides, but my improvements are applicable to either type. D are the guide posts; E is the car or platform, and F is the control cable.

G is a bearing member which may be secured to the side wall of the elevator shaft by any suitable means, such as the bolts H. The member G extends outward from the wall of the shaft but is so limited as to clear the car platform. At its outer end it is provided with a detachable cap I and beneath the cap is vertically slotted to receive a bar J having eyes K at opposite ends thereof for connection into the control cable. The bar J has its opposite sides toothed, as indicated at L, for engaging corresponding1y toothed dogs M in transversely extending recesses N in the member G. O are rods connected to the members M and extending outward from the member G, and P are springs sleeved upon said rods within the recesses N and operating to press the blocks M into engagement with the notches L. The rods 0 are connected by suitable intermediate mechanism to members actuated by the doors in closing, and, as shown, this intermediate mechanism comprises the Specification of Letters Patent.

Patented, Mar. 2, 1920.

Serial No. 274,411.

rods Q and Q, bell-crank levers R and rods Sand S. The rod S extends through the jamb of the door in such position that whenever the door B is swung to closed position it will press against the end of the rod S and through the intermediate mechanism will pull upon the rod G, withdrawing the dog M from its engagement with the notches L. On the other hand, when the door B is swung open, releasing the rod S, the tension of the spring P will force the dog M back into engagement with the teeth L. The rod S will be actuated in a similar manner by the door C, and, as shown, this door is provided with a bracket T for impinging against the end of said rod.

With the construction as described, the dogs M will be normally forced into engagement with the teeth L of the bar J by the tension of the springs P, and when thus engaged it will be impossible to actuate the control cable. The teeth L are preferably of such an angle that any force pulling upon the rod J will be within the' angle of friction and, therefore, will not tend to disengage the dogs M. When, however, the rods 0 are drawn outward by the closing of the door against the actuating rods S or S, the rod J will be free to move vertically in the slot in the member G.

The construction is one which can be manufactured at low cost and can be applied to practically any type of elevator. It is also applicable alternatively to elevators having doors in a single side or those in which the doors are upon opposite sides. In the latter case one of the intermediate rods, such as Q, is provided with an offset portion Q for passing back of the guide D.

What I claim as my invention is 1. In an elevator, the combination with the control cable, of a notched bar connected into said cable, a stationary bearing in which said bar is slidably secured, a plurality of dogs for engaging said notched bar to lock the same from movement, resilient means for yieldably pressing said dogs into engagement, a plurality of closures for the elevator shaft at the same landing, and connections between said closures and the respective dogs whereby said bar is released only when all of said closures are in closed position.

2. In an elevator, the combination with the control cable, of a bar connected into said cable and notched on its opposite edges, a fixed bearing in which said bar is slidably secured, said bearing-having recesses therein, dogs for respectively engaging the opposite notched edges of said bar, said dogs being slidable transversely to said bar in said recesses, resilient means for pressing each dog into engagement, and connections to said dogs extending into operative relation to closures on opposite sides of the elevator shaft, whereby said bar is released only upon the closing of both doors.

3. In an elevator, the combination with the control cable, the elevator shaft having a plurality of openings at the same station and independently operable closures for said openings, of a notched bar connected into said cable, a fixed bearing adjacent to a landing, in which said bar is slidably secured, said bearing having recesses therein, a plurality of dogs for engaging said notched bar to lock the same, said dogs being slidable transversely to said bar in said recesses, resilient means in said recesses for yieldably pressing said dogs into engagement, and connections tosaid dogs leading into operative relation to the respective closures for said elevator shaft, whereby said notched bar is only released when all of said closures are in closed position.

4. In an elevator, the combination with the control cable, of a locln'ng bar connected to said cable, and stationary bearings by which said bar is slidably engaged, a plurality of dogs engageable with said locking bar to restrain the cable from movement, resilient means for yieldably pressing said dogs into engagement with said bar, a plurality of closures for the elevator shaft at the same landing, and connections between said closures and the'resepctive dogs, whereby said bar is released only when all of said closures are in closed position.

5. In an elevator, the combination with the control cable, of a locking bar connected to said cable, a fixed bearing by which said bar is slidably engaged, said bearing having recesses therein, dogs oppositely engageable with said bar and transversely slidable in said recesses, resilient means for yieldably pressing each'dog into engagement with the bar, and connections to said dogs extending into operative relation to closures on opposite sides of the elevator shaft, whereby said bar is released only upon closing of both closures.

6. In an elevator, the combination with the control cable, the elevator shaft having a plurality of openings at the same station, and independently operable closures for said openings, of a locking bar connectedinto said cable, a fixed bearing adjacent to a landing in which said bar is slidab-ly secured, said bearing having recesses therein, a plurality of dogs for engaging said bar to lock the same, said dogs being slidable transversely to said bar in said recesses, resilient means in said recesses for yieldably pressing said dogs into engagement, and connections to said dogs leading into operative relation to the respective closures for said elevator shaft, whereby said locking bar is only released when all of said closures are inclosed position.

In testimony whereof I affix my signature.

HARTMAN STEIN'BACK. 

